remove pipeline head component and use staic HTML instead

app/assets/javascripts/vue_pipelines_index/index.js.es6

@@ -6,7 +6,6 @@
 /*= require ./status.js.es6 */
 /*= require ./store.js.es6 */
 /*= require ./pipeline_url.js.es6 */
-/*= require ./pipeline_head.js.es6 */
 /*= require ./stage.js.es6 */
 /*= require ./stages.js.es6 */
 /*= require ./pipeline_actions.js.es6 */

app/assets/javascripts/vue_pipelines_index/pipeline_head.js.es6

-/* global Vue, gl */
-/* eslint-disable no-param-reassign */
-
-((gl) => {
-  gl.VuePipelineHead = Vue.extend({
-    template: `
-      <thead>
-        <tr>
-          <th>Status</th>
-          <th>Pipeline</th>
-          <th>Commit</th>
-          <th>Stages</th>
-          <th></th>
-          <th class="hidden-xs"></th>
-        </tr>
-      </thead>
-    `,
-  });
-})(window.gl || (window.gl = {}));

app/assets/javascripts/vue_pipelines_index/pipelines.js.es6

@@ -74,7 +74,16 @@
         </div>
         <div class="table-holder" v-if='pipelines.length > 0'>
           <table class="table ci-table">
-            <pipeline-head></pipeline-head>
+            <thead>
+              <tr>
+                <th>Status</th>
+                <th>Pipeline</th>
+                <th>Commit</th>
+                <th>Stages</th>
+                <th></th>
+                <th class="hidden-xs"></th>
+              </tr>
+            </thead>
             <tbody>
               <tr class="commit" v-for='pipeline in pipelines'>
                 <status-scope